Terawatt is 1000000000000 watt units.
Terawatts to Nanowatts Converter — TW to nW
Convert Terawatt (TW) to Nanowatt (nW) using the exact conversion factor (1 terawatt = 1e+21 nanowatt). See the formula, worked examples, and conversion table.
Terawatts to Nanowatts converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Nanowatt is 1e-9 watt units.
Result = input x 1e+12 / 1e-9.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Terawatts to Nanowatts
Terawatt and Nanowatt both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Terawatt is 1000000000000 watt units, and nanowatt is 1e-9 watt units.
Formula
nanowatts = terawatts × 1e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 terawatt equals 1e+12 base units, and 1 nanowatt equals 1e-9 base units, so dividing one by the other gives the direct terawatt-to-nanowatt factor of 1e+21.
Simple example
1 TW × 1e+21 = 1e+21 nW
1 terawatt = 1e+21 nanowatts.
Real-world example
100 TW × 1e+21 = 1e+23 nW
100 terawatts = 1e+23 nanowatts.
Conversion table
| Terawatt (TW) | Nanowatt (nW) |
|---|---|
| 1 TW | 1e+21 nW |
| 10 TW | 1e+22 nW |
| 50 TW | 5e+22 nW |
| 100 TW | 1e+23 nW |
| 500 TW | 5e+23 nW |
| 1,000 TW | 1e+24 nW |
Reverse conversion: Nanowatt to Terawatt
1e+21 nW × 1e-21 = 1 TW
1e+21 nanowatts = 1 terawatts.
terawatts = nanowatts × 1e-21
For a page dedicated to this direction, see Nanowatt to Terawatt.
Understanding the Terawatt (TW)
Terawatt is 1000000000000 watt units.
Understanding the Nanowatt (nW)
Nanowatt is 1e-9 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanowatts are in 1 terawatt?
1 terawatt equals 1e+21 nanowatts, using the exact defined conversion factor rather than an estimate.
How do I convert terawatt to nanowatt?
Multiply the terawatt value by 1e+21. The converter above does this instantly to whatever precision you set.
How do I convert nanowatt back to terawatt?
Use the reverse factor: 1 nanowatt equals 1e-21 terawatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a terawatt?
Terawatt (TW) is a unit of engineering.
What is a nanowatt?
Nanowatt (nW) is a unit of engineering.
Is the terawatt to nanowatt conversion exact?
Yes. Both terawatt and nanowatt are defined by fixed standards rather than physical artifacts, so the factor of 1e+21 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.